Vertical resistor in 3D memory device with two-tier stack
First Claim
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1. A semiconductor device, comprising:
- a substrate;
a stack in a memory cell area of the substrate, the stack comprising a first tier and a second tier on the first tier, the first tier comprising a first set of alternating control gate layers and dielectric layers and the second tier comprising a second set of alternating control gate layers and dielectric layers, the stack comprising memory holes, each memory hole comprises a portion in the first tier and a portion in the second tier, and memory films extend along a wall of each memory hole;
a transistor formed on the substrate in a peripheral area, peripheral to the memory cell area, the transistor is in a circuit;
a first column in the peripheral area, the first column comprises polysilicon, a resistor in the circuit comprises the polysilicon in the first column, and the first column extends from a terminal of the transistor to a height of a top of the first tier, wherein a doping concentration of the first column varies radially relative to a central longitudinal axis of the resistor; and
a second column which extends from the height of the top of the first tier to a height of a top of the second tier, the second column is electrically connected to the first column.
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Abstract
A vertical, columnar resistor in a semiconductor device is provided, along with techniques for fabricating such a resistor. The resistor may be provided in a peripheral area of a 3D memory device which has a two-tier or other multi-tier stack of memory cells. The structure and fabrication of the resistor can be integrated with the structure and fabrication of the stack of memory cells. The resistor may comprise doped polysilicon. In an example implementation, a polysilicon pillar extends a height of a first tier of the stack and a metal pillar above the polysilicon pillar extends a height of a second tier of the stack.
47 Citations
20 Claims
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1. A semiconductor device, comprising:
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a substrate; a stack in a memory cell area of the substrate, the stack comprising a first tier and a second tier on the first tier, the first tier comprising a first set of alternating control gate layers and dielectric layers and the second tier comprising a second set of alternating control gate layers and dielectric layers, the stack comprising memory holes, each memory hole comprises a portion in the first tier and a portion in the second tier, and memory films extend along a wall of each memory hole; a transistor formed on the substrate in a peripheral area, peripheral to the memory cell area, the transistor is in a circuit; a first column in the peripheral area, the first column comprises polysilicon, a resistor in the circuit comprises the polysilicon in the first column, and the first column extends from a terminal of the transistor to a height of a top of the first tier, wherein a doping concentration of the first column varies radially relative to a central longitudinal axis of the resistor; and a second column which extends from the height of the top of the first tier to a height of a top of the second tier, the second column is electrically connected to the first column. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A semiconductor device, comprising:
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a substrate; a transistor formed on the substrate, the transistor is in a circuit; a polysilicon column which is a resistor in the circuit, the polysilicon column is tapered, becoming narrower at a bottom of the polysilicon column, the polysilicon column comprise a core along a central vertical axis of the polysilicon column and a layer which surrounds the core, and the layer has a different doping concentration than the core; and a metal column which is above the polysilicon column, wherein a bottom of the polysilicon column contacts a terminal of the transistor, a bottom of the metal column is on a top of the polysilicon column, and the metal column is tapered, becoming narrower at a bottom of the metal column. - View Dependent Claims (19, 20)
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Specification